Frost dates in Ireland 2026 — the county-by-county guide to safe planting

A cold snap can still bite when gardens feel springlike, and that’s when new seedlings meet their match. The safest way to start strong is to know your local last-frost window, then plant on a timetable that respects your microclimate and your crop’s tolerance. “Planting a week late never ruined a harvest, but planting a week early often has,” as one allotment keeper in Galway likes to say.

Frost risk in Ireland is shaped by latitude, the softening Atlantic, and the shelter or exposure of nearby hills. Coastal sites are often frost-free earlier, while inland basins and higher ground hang on to cold a bit longer. Treat the dates below as typical last-frost windows, not guarantees, and adjust for your own patch.

How this guide works

These are “last spring frost” ranges, meaning the period after which frost is uncommon for most gardens. If you’re risk-averse with tender plants, wait until the end of your county’s window or add one extra week. If you can protect with fleece, cloches, or cold frames, you can nudge the calendar a touch earlier.

Remember that sheltered courtyards, south-facing walls, and urban heat can shift dates a few days sooner, while north-facing slopes or valley bottoms can run a week or two later. “Know your bed, not just your county,” as a Kerry grower puts it.

Quick rules for 2026

• Watch a trusted local forecast for nights at 2°C or below, and cover as needed.
• Harden off seedlings for 7–10 days before their on-soil debut.
• Keep backup transplants so a chill doesn’t wipe your whole plan.
• Fleece plus a low tunnel buys you roughly one hardiness zone.
• If in doubt, direct-sow hardy crops and pot-on the tender ones.

County-by-county: Republic of Ireland

Cork — Coast often safe from early April; inland hangs on to mid-April; uplands late April.
Kerry — Coast late March to early April; interior mid-April; high passes late April.
Waterford — Mild coast is early April; inland pockets mid-April on average.
Wexford — Breezy coast early April; central areas mid- to late April.
Dublin — Urban heat helps by mid-April; exposed fringes hold to late April.
Louth — Lowland sites mid-April; higher or inland spots late April.
Meath — Broadly mid- to late April, with cooler hollows into early May.
Kildare — Expect late April into early May for safer tender-planting windows.
Laois — Late April typical; uplands or valleys can stretch into early May.
Offaly — Central plains risk into late April; sheltered gardens early May safe.
Westmeath — Late April to early May, depending on exposure and elevation.
Longford — Often pushing early May; protect tender sets if nights look chilly.
Roscommon — Late April into early May across mixed inland terrain.
Galway — Coast mid-April; inland late April to early May; Connemara hills later.
Mayo — Maritime west mid-April; inland/upper ground early to mid-May.
Sligo — Coastal gardens mid-April; interior late April to early May.
Leitrim — Frequently early to mid-May; hedges and covers are your friends.
Donegal — Coast mid-April; interior and east early May; uplands mid-May.
Monaghan — Typically early May; watch for radiative frosts under clear skies.
Cavan — Early May standard; frost pockets linger after calm, bright days.
Clare — Burren/coast mid-April; inland late April, higher ground early May.
Limerick — Mid-April near the city; rural hollows late April.
Tipperary — Late April to early May across its broad, varied valleys.
Kilkenny — Mid- to late April; river-bottom sites can run a shade later.
Carlow — Late April typical; early May safest for very tender crops.
Westmeath — Already listed; see late April to early May note above.
Wicklow — Coast mid-April; uplands early to mid-May depending on height.

County-by-county: Northern Ireland

Antrim — Belfast/coast mid-April; inland and Antrim Plateau late April to early May.
Down — Coast mid-April; interior late April; Mournes push into early May.
Armagh — Often early May for tender sets; sheltered walls help a lot.
Fermanagh — Early to mid-May thanks to lakes and cool, calm nights.
Derry/Londonderry — Coast mid- to late April; inland early May.
Tyrone — Early to mid-May with upland sites the last to be safe.

What to plant when

Use the early edge of your window for hardy sorts like kale, broad beans, onions, peas, chard, and first early potatoes under fleece. These shrug off a light nip and make use of cool soils.

Hold tomatoes, cucumbers, squash, French beans, dahlias, and sweetcorn until your local last-frost window has clearly passed, or give them protected time in a tunnel or greenhouse. “If you’d cry to lose it, keep it under cover,” says a veteran plotter from Wexford.

Finally, record what actually happens on your own plot this year: dates, lows, and what survived under which protection. Next spring, your notes will be the best local forecast you’ll ever read, and your planting will feel calm, timely, and confidently frost-proof.